Machine for grinding solid bodies.



A. J. BRIGSSON. v MACHINE FOR GRINDING SOLID BODIES.

APPLICATION FILED JAN. 6, 1908.

' Patented N0v.2, 1909.

3 SHEETS-SHEET 1.

f A Jid E F a i j g/J Inventor.

Witnesses.

A. J. 'ERIUSSON. v MACHINE POE GRINDING SOL ID BODIES.

Patented Nov. 2, 1909.

3 SHEETS-SHEET 2.

A. LERIGSSON. MACHINE FOB. GRINDING SOLID BODIES.

APPLICATION FILED JAN. 6, 190B.

Patented Nov. 2, 1909.

Inventer.

3 SHEETS-SHEET 3.

Wm. @w/

UNTTE STATS ATENT FFTQE.

ANDERS JOHAN ERICSSON, OF STOCKSUND, SWEDEN.

MACHINE FOR, GRINDING. SOLID BODIES.

To all whom it may concern:

Be it known that I, ANDnRs J OHAN ERICSSON, of Stocksund, Sweden, asubject of the King of Sweden, have invented certain new and usefulImprovements in Machines for Grinding Solid Bodies; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

In powdering apparatus two round bodies of stone, steel or othermaterial have been almost exclusively employed, the one body remainingstationary while the other rotates. If a hi h eitl'ectivity of suchmachine be clesired, increase of the diameter has been exclusivelyresorted to. It is, however, manifestly incorrect to increase theeffectivity in this manner, as the speed between the grinding surfacesbecomes quite different at the periphery and toward the center. In orderto obtain a good grinding result a certain relative speed of thegrinding surfaces is necessary. Whether large or small stones are used,the most advantageous grinding effect is only obtained at a certaindistance from the center, and both at greater and less distances fromthe center the grinding effect is less advantageous.

This invention has for its object to evade this drawback, and instead oftwo large stones or plates a plurality of smaller ones is used, whichare placed over each other, whereby corresponding plates of each pairare mutually connected into one series and the other ones to anotherseries. The one series is put in rotation, and the other may also berotated or may remain stationary. Each alternate space between theplates communicates with a receptacle wherein the material to be groundis introduced and from whence it spreads simultaneously to said spaces.The other spaces are of such width as to permit a relative adjustment ofthe plates. By this arrangement it is made possible to increase thecapacity of grinding-machines to an essential degree without having thegrinding take place under more disadvantageous conditions than when thecapacity is smaller. Another advantage is Specification of LettersPatent.

Application filed. January 6, 1908.

Patented Nov. 2, 1909.

Serial No. 409,545.

that the machine is more compact and less bulky in form.

Another advantage in this invention is that the grains or largerparticles which are crushed immediately on being introduced between thegrinding surfaces may be rapidly removed out of the machine, forpreventing doughy formations, in that the series of stationary platesmay be made to r0- tate, as well as the rotating plates though withsomewhat different speeds, whereby the material between the two grindingsurfaces is, by means of the influence of centrifugal power, quicklyremoved from the machine. Such a proceeding gives another advantage,namely, that the feeding of the material to be crushed or powdered isdone by the influence of centrifugal power, whereby no special externalpressure need be supplied for effecting this feeding. The same conditionexists with the material already powdered or crushed, which leaves themachine in consequence of the outward pressure caused by the centrifugalpower.

The invention is illustrated in the annexed drawing, in which Figure 1is a vertical section of a machine provided with a plurality of conicalplates; Fig. 2 is a similar view of a modification; Fig. 3 is a partialplan view of one of the plates; Fig. 4 a like view of a modification,and Fig. 5 is a detail view of the adjusting means. Fig. 6 is anelevation, partly in section, of the machine and means for mounting anddriving the shafts.

In the drawings a designates one series of plates, which by means ofbolts 1) or the like are assembled and connected with a bottom plate 0connected to a shaft cl, which latter may either be stationary orrotary. Said plates are spaced apart by means of rings 6 provided withholes for the bolts 7) and mounted between the outer edges of the platesa. Said rings are further provided with openings through'which thematerial is thrown out from the spaces between the plates. 6 designatesthe other series of plates extending into each chamber, which togetherwith the plates (4 form the grinding chambers f. The plates 6 arecarried by a central part suitably in the form of a perforated tube g,and said plates are spaced apart and joined together at their inneredges by means of rings 9 resting on the inner edges of the plates, therings being pressed down upon said edges by a nut g which is screwedonto the perforated tube 9 as shown in Fig. l. The material to be groundis introduced into the perforated tube 9 and passes out through holes itin the tube 9 and through corresponding holes h in the rings 9 to thechambers 7 between the plates a and e. The ground material passes fromthe chambers 7" through the holes in rings Z) over the outer edges ofthe plates a. If desired a casing N shown in Fig. 6, may be placedaround the grinding plates and is preferably secured thereto by means ofthe bolts 72 passing through an inwardly projecting flange formed on theupper edge of the casing. The casing is distanced from the outer edgesof the plates a to form an annular space between it and said plates. Theground mate rial thrown out through the holes in rings 6 by centrifugalforce will strike against the casing and be directed downward. The tube9 is connected to the shaft 2' situated inside the shaft (Z, whichlatter may be suitably journaled in a bracket as D. Either of the shafts(Z and 2' may be put in rotation by gears d and z" respectively keyed tosaid shafts as shown in Fig. 6, or both shafts can rotate, though with"different speed. In the latter case an outward directed centrifugalpower arises, which aids both the feeding of the material to be powderedor crushed and the removal of the already crushed material.

The plates 64 and e are preferably, though not necessarily, providedwith spiral grooves, such as indicated by a, Fig. 3, or with radialgrooves, as c, Fig. 4:.

Any suitable means may be provided for moving the shafts longitudinallyfor the purpose of adjusting the plates to increase or diminish .thespace between them for producing a coarser or finer material. A suitable adjusting means is shown in Fig. 5, which consists of a collar isfixed on the end of the hollow shaft d, said collar having an end flange7c forming a bearing for a supporting nut Z for the inner shaft z'.Surrounding the latter is a conical bearing sleeve m having a flange mprojecting under the end of the shaft (Z and serving as a lock for thenut Z. The inner shaft 2' is screw-threaded and works in nut Z, and byholding the nut stationary by means of a suitable tool the shaft 2' maybe raised or lowered the desired degree, whereupon the sleeve m islocked to the shaft (Z by screwing the nut Z against the flange m. Thescrew threads are formed so that the rotation. of either shaft withrelation to the other will have a tendency to tighten the nut againstthe flange m.

I claim l. A device for grinding or crushing solid material consistingof a central perforated tube forming a containing and distributingchamber, a series of superposed plates surrounding the latter, the inneredge of. the bottom plate of said series resting on a flange formed onsaid tube, spacing rings interposed between the inner edges of theremaining plates of said series, a nut adjustable on the upper end ofthe tube to clamp the rings and plates to said flange, a second seriesof plates entering the spaces formed between the first series of plates,spacing members interposed between the outer edges of said second seriesof plates, bolts connecting the latter to the spacing members, a supportfor the second series,the last named series of plates forming with thefirst named series on one side a series of grinding or crushing spacesfor the material and means for imparting a relative rotation to saidplates.

2. A device for grinding or crushing solid material consisting of acentral perforated tube forming a containing and distributing chamber, aseries of superposed plates surrounding the latter, the inner edge ofthe bottom plate of said series resting on a flange formed on said tube,spacing rings interposed between the inner edges of the remaining platesof said series, a nut adjustable on the upper end of the tube to clampthe rings and plates to said flange, a second series of plates enteringthe spaces formed between the first series of plates, spacing membersinterposed between the outer edges of said second series of plates,bolts connecting the latter to the spacing members, a shaft supportingthe second series, the last named series of plates forming with thefirstnamedseries on one side a series of grinding or crushing spaces for thematerial, said spaces communicating with the perforated tube, means forimparting a relative rotation to said plates and means to adjust saidplates relative to each other.

In testimony, that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

ANDERS JOHAN ERIGSSON,

Witnesses GUSTAF ALsoN, HJALMAR ZETURSIROM.

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